计算出一列中两个值之间的差异，同时保持在另一列的边界中？

import pandas as pd

# 创建示例DataFrame
data = {
    'values': [10, 15, 8, 20],
    'boundaries': [5, 3, 7, 10]
}
df = pd.DataFrame(data)

# 计算相邻值的差异
df['differences'] = df['values'].diff()

# 确保差异在边界内
df['adjusted_differences'] = df.apply(
    lambda row: min(max(row['differences'], -row['boundaries']), row['boundaries']),
    axis=1
)

print(df)

   values  boundaries  differences  adjusted_differences
0      10           5           NaN                  NaN
1      15           3            5                    3
2       8           7           -7                   -7
3      20          10            12                   10